Spark plug



Nov 3, 1925. 1,560,513

.L. HIRSCH SPARK PLUG Filed July 26, 1924 WITNESSES. INVEJYTOR,

m I Louw Jfirsch- MW/y I A TTORNEYS.

Patented Nov. 3, 1925.

UNITED STATES LOUIS HIRSGH, OF MESILLA PARK, NEW MEXICO.

SPARK PLUG.

Application filed July 26, 1924. Serial No. 728,412.

To all whom it may: concern:

Be it known that I, LOUIS Hrnson, a citizen of the United States, and aresident of Mesilla Park, in the county of Dona Ana and State of NewMexico, have invented a new and Improved Spark Plug, of which thefollowing is a full, clear, and exact description.

This invention relates to improvements in spark plugs, an object of theinvention being to provide an improved construction for plug wherein apair of sparks is provided at the inner end of the plug so as to insurea more complete combustion and therefore greater power with more speedand less carbon accumulation.

A further object is to provide a spark plug with a pair of electrodeshaving terminals spaced apart, with an isolated conductor interposedbetween them and spaced from both, whereby the current is caused to jumpfrom one terminal to the conductor and from the latter to the otherterminal thereby insuring a plurality of sparks simultaneously.

A further object is to provide a plug of this character which may beconnected in any electric circuit, either in multiple are or series andarranged to suit the trade.

\Vith these and other objects in View, the invention consists in certainnovel features of construction and combinations and arrangements ofparts which will be more fully hereinafter described and pointed out inthe claims.

In the accompanying drawings- Figure 1 is a view in longitudinal sectionillustrating my improved spark plug;

Figure 2 is a view in transverse section on the line 22 of Figure 1;

Figure 8 is a view in transverse section on the line 3*? of Figure 1;

Figure 1 is a plan view of the gasket or washer 9.

1 represents the casing of my improved spark plug having ascrew-threaded inner end 9 for attachment to the engine cylinder andprovided with an internal annular shoulder 3 and an internallyscrew-threaded outer end l. 5 represents the core of the plug, which isof porcelain or any other suitable insulating material, and this core 5is made with an enlargement 6 which is engaged by a nut 7 screwed intothe threaded outer end of the casing 1, with a washer or gasket 8interposed between the nut 7 and the enlargement 6, and a second washeror gasket 9 interposed between the enlargement 6 and the shoulder 3.

The core 5 is of general cylindrical form throughout its upper or outerportion but its lower or inner portion is of general elliptical shape sothat the washer 9 has an elliptical opening 10 to accommodate the lowerend of the core. The inner face of the casing 1 is recessed in oppositesides, as shown at 11, to accommodate the elliptically-shaped end of thecore, and said core is made with a pair of longitudinal bores 12receiving electrodes 13 therein. Binding posts 14: are provided on theouter ends of the electrodes 13 and the inner ends of the electrodes arebent toward each other, forming terminals 15. An electric conductor 16,which may constitute an ordinary piece of wire, is secured in the lowerend of the core 5 between the terminals 15 and spaced from bothterminals so that the electric current is compelled to jump from oneterminal 15 to the conductor 16 and from the latter to the otherterminal 15, whereby a pair of sparks is formed to insure ignition ofthe charge and give improved results. The inner end of the core 5 wherethe electrodes pass therethrough is preferably recessed, as shown at 17,so as to prevent an accumulation of carbon to interfere with the properfunctioning of the plug.

Various slight changes and alterations might be made in the general formof the parts described without departing from my invention, and hence Ido not limit myself to the precise details set forth but consider myselfat liberty to make such slight changes and alterations as fairly fallwithin the spirit and scope of the appended claim.

I claim: 1

A spark plug, including a casin a core in the casing, a pair ofelectrodes in the core, an isolated electric conductor located at theinner end of the core and spared from the terminals of the electrodes,said core at its inner end being substantially elliptical in crosssection, the shell or casing being substantially circular in crosssection and having recesses in its opposite walls whereby the surface ofthe shell or casing is spaced from the edges of the core.

LOUIS HIRSCH.

